.contain__wrap {
  background: lightgray;
  color: #fff;
  font-weight: bold;
  font-size: 20px;
  .a {
    padding: 50px;
    background: red;
    .b {
      padding: 80px;
      background: #ff8800;
      .c {
        padding: 40px;
        background: #a2ff00;
      }
    }
  }

}
